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Control method and device of Vienna-like three-level circuit

A control method and technology of a control device, which are applied in the direction of output power conversion device, high-efficiency power electronic conversion, electrical components, etc., can solve the problem of inability to achieve zero-voltage turn-on, and achieve the effect of zero-voltage turn-on

Inactive Publication Date: 2017-06-09
EMERSON NETWORK POWER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a control method and device for a Vienna-like three-level circuit, which is used to solve the problem that the high-frequency bridge arm switch tube cannot be turned on at zero voltage in the prior art

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  • Control method and device of Vienna-like three-level circuit

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Embodiment Construction

[0047] In order to provide a realization scheme of zero-voltage turn-on of high-frequency bridge arm switches in a Vienna-like three-level circuit, embodiments of the present invention provide a control method and device for a Vienna-like three-level circuit. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not used to limit the present invention. And if there is no conflict, the embodiments in the application and the features in the embodiments can be combined with each other.

[0048] The embodiment of the present invention provides a control method of a Vienna-like three-level circuit, such as figure 2 As shown, the following steps can be included:

[0049] Step 201: In the positive half cycle of the AC input voltage of the Vienna-like three-level circuit, detect the inductor current for each inductance connected to the high-frequency bridge arm in the working state in the Vienna-like th...

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Abstract

The invention discloses a control method and device of a Vienna-like three-level circuit. With the control method and device adopted, zero-voltage switching on of a high-frequency bridge arm switching tube can be realized, and circuit loss can be reduced. The control method comprises the following steps that: the inductance current of an inductor which is connected with each high-frequency bridge arm in an operating state in the Vienna-like three-level circuit is detected in the positive half cycle of the alternating current input voltage of the Vienna-like three-level circuit; when the freewheel switching tube of the high-frequency bridge arm connected with the inductor is in an on state, and the main switching tube of the high-frequency bridge arm is in an off state, if it is detected that the inductance current does not reach preset negative current, the freewheel switching tube in the on state is controlled to be in the on state continuously, and the main switching tube in the off state is controlled to be in the off state continuously; and if it is detected that the inductance current reaches the preset negative current, the freewheel switching tube in the on state is controlled to be switched off, and the main switching tube in the off state is controlled to be switched on.

Description

Technical field [0001] The invention relates to the technical field of power electronics, and in particular to a control method and device of a Vienna-like three-level circuit. Background technique [0002] At present, various three-level circuits have been widely used in many fields due to their high efficiency. figure 1 Shown is a common Vienna-like three-level circuit, including the switch tubes Q1 and Q2 forming the power frequency bridge arm, the switching tubes S1 and S3 forming the first high frequency bridge arm, and the second high frequency bridge arm. The switching tubes S2 and S4, as well as the inductors L1 and L2, and the bus capacitors Co+ and Co-; the first high-frequency bridge arm and the second high-frequency bridge arm are connected in series to form a branch, and the two ends of the branch are Vienna-like The DC output terminal of the three-level circuit; the connection node between the first high-frequency bridge arm and the second high-frequency bridge arm,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/162
CPCH02M7/1626H02M7/217H02M1/0058Y02B70/10
Inventor 毛云鹤武志贤李剑
Owner EMERSON NETWORK POWER CO LTD
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